About Shiraito Waterfall (Shiraito-no-taki [白糸の滝])
The Shiraito Waterfall (shiraito-no-otaki [白糸の滝]; “White Thread Falls”) was an impressively wide spring-fed waterfall stretching some 70m in width and about 3m in height over that stretch.
Not to be confused with the similarly-named waterfall on the slopes of Mt Fuji, this particular one was located near Karuizawa.

Karuizawa is typically an upscale ski resort that well-to-do people from Tokyo would go to, especially since there’s public transportation to get here.
However, in the Summer (we showed up in July 2023), it seemed like this waterfall was one of the main draws to the resort as we easily shared this place with maybe around a hundred others.
Indeed, even though we self-drove here, it’s possible to take the Hokuriku Shinkansen from Tokyo to Karuizawa Station, and then take the bus from there to this waterfall’s car park for a 5-minute walk.
I’d imagine the convenient access further exacerbated this place’s popularity though we also encountered plenty of self-drivers as well (given how busy its car park was).

There were also tour buses to add to the tourist crush so indeed, this is not the kind of place to be seeking a true back to Nature experience.
Speaking of the Nature, the Karuizawa Shiraito Waterfall’s spring is fed from precipitation falling into Mt Asama before seeping underground into aquifers.
It’s said that it takes 6 years for the water to travel through the groundwater system before re-emerging as springs at this waterfall.
Therefore, it’s also said that this stream never dries up (even in the icy winter months) because the water’s temperature tends to stay constant at 11.8 degrees C.

It’s believed that this relatively warm water temperature for a mountain stream is largely due to geothermal heating around Mt Asama, which is still geologically active.
As for experiencing the Shiraito Falls, from the car park (see directions below), it was a mere 200-300m walk in each direction to the viewing area.
The walk pretty much followed along the stream, and its constant moisture gave rise to walls of ferns pretty much lining the entire walk.
Meanwhile, the car park itself had a pretty happening food stand and toilet facility so it definitely felt like one of the more commercialized waterfalls that we’ve been to.

Anyways, our visit was pretty short and sweet as we spent less than an hour away from the car, but of that time, I’d bet barely 15 minutes of that time was spent walking.
Finally, I did notice signage mentioning that there are other waterfalls in the Karuizawa vicinity such as Sengataki (千ヶ滝) and Ryugaeshi (竜返しの滝).
However, on our July 2023 visit, we just focused on the Shiraito Waterfall, and perhaps on the next visit, I’ll have the time to pursue the others and do a write-up about them.
Authorities
The Karuizawa Shiraito Waterfall resides near the town of Karuizawa in the Nagano Prefecture, Japan. It may be administered by local authorities from Karuizawa. For information or inquiries about the area as well as current conditions, you can try visiting the Karuizawa Tourist Association website.
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